Author: José Carlos
Date: 11:06:03 02/14/01
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On February 14, 2001 at 12:37:52, Larry Griffiths wrote: >On February 14, 2001 at 10:11:53, Carmelo Calzerano wrote: > >>On February 14, 2001 at 09:35:58, Larry Griffiths wrote: >> >>>Carmelo, >>> >>>I will dink around with the hash table some more and see if I can find a bug >>>somewhere. >>> >>>Is this Fine 70? >>> >>>[D]8/k7/3p4/p2P1p2/P2P1P2/8/8/K7 w - - >> >>Exactly ;-) >> >>Bye, >>Carmelo > >Ok Carmelo, > >I did find a bug in my hash code and am getting upper_bound cutoffs now. >I owe you one since I was about to give up on the hash table for a while. >I ran the Fine 70 position using a 16meg hash table. My hash tables are >28 bytes in size. > >My program goes 17 plys in 18 seconds without the hash table, >and 19 plys in 6 seconds with the hash table. > >I noticed that Hardly any of the 16meg hash table was used. I am only using 1 >slot per hash key, and maybe if I add/look at the next 8 slots I can get some >more entries in the hash table and go deeper on plys. I don't know what you mean with the slots thing (though I figure), but I think you may have a problem with the hash codes, because you're doing too slow in this problem, and don't even fill 1 Mb of the hash... I may be wrong, but I think your hash codes are not different enough for similar positions. José C. >I do not know if I will >be able to get 33 plys (impressive). I found a bug in my hash table code a few >days ago that might explain why my program was making bad moves with my old hash >table code. >Thanks so much for your help. >By the way, what is your chess program name? > >Larry.
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